The United States has said there is "mounting evidence" that Syria,
Iran and Hezbollah are planning to topple the Lebanese government.
The White House said Syria hoped to stop the formation of an international tribunal
to try suspects in the killing of former Lebanese PM Rafik Hariri.
The BBC News website's world affairs correspondent Paul Reynolds
says the White House statement appears to result from the tense situation in Lebanon,
where Hezbollah is demanding one third of cabinet seats, thereby giving it a veto over decisions.
The statement also casts doubt on any willingness by the Bush administration
to consider Syria and Iran as potential partners over the future of Iraq